CVE-2025-9090
Published: 17 August 2025
Summary
CVE-2025-9090 is a medium-severity Injection (CWE-74) vulnerability in Tenda Ac20 Firmware. Its CVSS base score is 6.3 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Network Device CLI (T1059.008); ranked in the top 12.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Developer assessments and testing (including injection-focused techniques) identify improper neutralization of special elements, and the verifiable flaw remediation corrects them pre-deployment.
Identifies indicators of injection attacks (command, SQL, LDAP, etc.) via anomaly and attack monitoring.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Command injection in the web-managed Telnet service enables remote exploitation of a public-facing application (T1190), exploitation of remote services (T1210), indirect command execution (T1202), and execution of CLI commands on the network device (T1059.008).
NVD Description
A vulnerability was identified in Tenda AC20 16.03.08.12. Affected is the function websFormDefine of the file /goform/telnet of the component Telnet Service. The manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been…
more
disclosed to the public and may be used.
Deeper analysisAI
CVE-2025-9090 is a command injection vulnerability (CWE-74, CWE-77) affecting Tenda AC20 routers on firmware version 16.03.08.12. The flaw resides in the websFormDefine function within the /goform/telnet file of the Telnet Service component. Published on 2025-08-17, it has a CVSS v3.1 base score of 6.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L), rated as medium severity.
An attacker with low privileges can exploit this vulnerability remotely with low complexity and no user interaction required. Manipulation of the affected function enables command injection, potentially allowing limited impacts on confidentiality, integrity, and availability, such as executing arbitrary commands on the device.
Advisories and references, including VulDB entries (ctiid.320358, id.320358, submit.632232) and a GitHub repository, document the issue and provide POC exploit steps. No specific patches or mitigations are detailed in the available information.
The exploit has been publicly disclosed via GitHub and may be used by attackers.
Details
- CWE(s)